A raggle is a horizontal slot cut or cast into a vertical substrate, such as a brick or concrete wall. Waterproofers and masons insert the turned-in upper edge of a metal counterflashing or reglet into this groove, then seal it with lead wedges and sealant. This mechanical embedment prevents water from running down the wall and behind the flashing assembly.
Grind a one-inch deep raggle into the brickwork right above the roof line so we can tuck the counterflashing in.
Ensure the raggle is cut deep enough and blown clean of dust, otherwise the sealant will fail and allow water behind the flashing.
Also heard as
- reglet groove
Related terms
Counterflashing
Flashing set into the wall above a base flashing, overlapping it downward to shed water off its top edge.
Base flashing
The primary membrane plies that transition a roof system up a vertical surface.
Through-wall flashing
Flashing that runs from the back of a masonry cavity out through the wall face to drain water outside.